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(No Model.) Y 2 Sheets- Sheet 1. J. H. GUEST.

ELECTRIC ARC LAMP.

Patented Oct. 10.51882..

(No Model.) 2 Sheets-Sheet 2.

J. H. GUEST.

ELECTRIC ARG LAMP. Nol 265,670. Patented Got. 1G, 1882.`

UN TTED STATES PATENT OEEICE.

JOHN H. e-UEsT, OE BROOKLYN, NEW YORK.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 265,670, dated October 10, 1882.

Application filed June To all whom it may concern Be it known that I, JOHN H. GUEST, of Brooklyn, in the county of Kings and State of New York, have invented an Improvement in Electric Lamps, of which the following is a specification.

The object of this invention is to regulate the arc between the carbon points and to feed the carbon from time to time by one electromagnet of high resistance placed in a shuntcircuit, and mechanism acting therewith, so that the several costly magnets and appliances heretofore employed may be dispensed with and the operations simplified.

In the drawings, Figure 1 is an elevation of the magnet and mechanism. Fig. 2 is a section at m x. Fig. 3 represents the lower car bon holder. Fig. 4 is a diagram view to show the circuit-connections.

The lower-carbon holder a maybe provided with an armature, b, and magnets c to draw down the lower carbon and establish the arc, as represented in Fig. 3, and which corresponds generally with the devices for this purpose shown in my Patent No.259,007; or the lower carbon may be drawn down by the action of a thermostatic spring, d, receiving heat from a block of carbon or similar material, d', through which the circuit passes, as seen in Fig. 4. This device corresponds generally to that shown in my Patent No. 254,546.

I do notlimit myself to any particular means for separating the carbons by drawing down the lower-carbon holder.

The upper-carbon holderf is of any suitable construction. It is preferably a round rod of sufcient length to pass through the plates g h, that support the mechanism of the lamp. Around this holderjthere is atubular sleeve, k, terminating at the upper end in the crossbar Z that carries the cores of the solenoid-helices m. rlhereis also across-head,u, connected to the sleeve 7c by an adjusting-screw, and this cross-head u slides freely upon the stationary rods o o, that are supported at their ends by the plates g and 7L.

Around the rods o there are helical springs p and nuts qby means of which the action ofthe springs p upon the cross-head u can be adjusted.

Around the lower end ot1 the sleeve 7c there 22, 1882. (No model.)

is an annular Hange, 4, and around the rod of the carbon-holder there is a clamp7 fi, having a hook, 15, that passes up over the flange 4. The stop-screws 5 G 7 perform the duty otlimiting the movements ot' the clamp t'.

The solenoid-helices are of high resistance, and are placed in a shunt between the -Jfbinding-post and the binding-post, and it is preferable to employ dash-pots c with plungers connected with the respective solenoid-cores, as indicated by dotted lines, to prevent flickering ot' the lamp.

rlhe operation is as follows: In a state ot rest the two carbon electrodes should be in contact. When the current is turned on it passes by the binding-post to the plates g and h and metallic parts, the upper-carbon holderf and carbon, thence to the lower carbon and holder, and through the helices c or thermostatic spring d, according to which one is used, and thence, by the wire 11 and frame t and an insulated wire, 9, to the binding-post.. At the same time part of the current passes through the helieesm in theshunt-circuit. rlhecarbons are separated by the lower carbon being drawn down as aforesaid. The springs p are sufficient to resist the power of the solenoid when the are is of the proper length; but as the carbon is consumed the magnetism in the helicesmis increased by a larger amount of current passing by the shunt, the cores and cross-bar Z are drawn down` against the action ofthe springs p, and the upper carbon moved toward the lower carbon until the clamp il is relieved from the upper-carbon-holder rod by touching upon the screw-stop (i, which allows the upper earbon to drop, and the magnetism in m is instantly lessened. per carbon, reestablish the arc, and the operations arerepcated.

It is evident that this lamp can be used without any device for drawing down thelower carbon, for if the carbon electrodes are not in contact when the lamp is started the current pass ing through the high-resistance helices ot' the shunt will act upon the solenoid-cores and draw them down and liberate the clamp of the upper-carbon holder, so that the upper carbon will be moved by gravity into contact with the lower carbon, closing the main lamp circuit and lessening the current in the solenoid, so

The springs 1J raise the up- IOO that the springs Will act to lift the upper carbon and establish the are. This is not always the best mode of procedure, as the helices of the solenoids may become heated.

I claim :ts my invention- 1. The combination, with the upper-carbon holderj', ot' the tubular sleeve L', the two solenoid-helices m, ltheir cores, and cross-bar Z, counected to said sleeve 7c, the cross-bend u, guiderods o, springs p, ange 4; upon the sleeve k, the clamp t', and stops, substantially as set forth.

2. The combination, with the cau'bons and carbon-holders in an electric lamp, of a clamp, i, acting upon the upper-carbon-holding rod,

a. sleeve around such rod with zt ilnnge acting 1:5

upon the clump7 springs p to mise the carbonholder Iand parts therewith connected, a solenoid-magnet of high resistance in EL shunt, Jche cores of which solenoid are connected to the mechanism supporting the upper carbon to 2o 

